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Breast Cancer Research
Published in: Breast Cancer Research 6/2004

Open Access 01-12-2004 | Research article

Role of Notch signaling in cell-fate determination of human mammary stem/progenitor cells

Authors: Gabriela Dontu, Kyle W Jackson, Erin McNicholas, Mari J Kawamura, Wissam M Abdallah, Max S Wicha

Published in: Breast Cancer Research | Issue 6/2004

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Abstract

Introduction

Notch signaling has been implicated in the regulation of cell-fate decisions such as self-renewal of adult stem cells and differentiation of progenitor cells along a particular lineage. Moreover, depending on the cellular and developmental context, the Notch pathway acts as a regulator of cell survival and cell proliferation. Abnormal expression of Notch receptors has been found in different types of epithelial metaplastic lesions and neoplastic lesions, suggesting that Notch may act as a proto-oncogene. The vertebrate Notch1 and Notch4 homologs are involved in normal development of the mammary gland, and mutated forms of these genes are associated with development of mouse mammary tumors.

Methods

In order to determine the role of Notch signaling in mammary cell-fate determination, we have utilized a newly described in vitro system in which mammary stem/progenitor cells can be cultured in suspension as nonadherent 'mammospheres'. Notch signaling was activated using exogenous ligands, or was inhibited using previously characterized Notch signaling antagonists.

Results

Utilizing this system, we demonstrate that Notch signaling can act on mammary stem cells to promote self-renewal and on early progenitor cells to promote their proliferation, as demonstrated by a 10-fold increase in secondary mammosphere formation upon addition of a Notch-activating DSL peptide. In addition to acting on stem cells, Notch signaling is also able to act on multipotent progenitor cells, facilitating myoepithelial lineage-specific commitment and proliferation. Stimulation of this pathway also promotes branching morphogenesis in three-dimensional Matrigel cultures. These effects are completely inhibited by a Notch4 blocking antibody or a gamma secretase inhibitor that blocks Notch processing. In contrast to the effects of Notch signaling on mammary stem/progenitor cells, modulation of this pathway has no discernable effect on fully committed, differentiated, mammary epithelial cells.

Conclusion

These studies suggest that Notch signaling plays a critical role in normal human mammary development by acting on both stem cells and progenitor cells, affecting self-renewal and lineage-specific differentiation. Based on these findings we propose that abnormal Notch signaling may contribute to mammary carcinogenesis by deregulating the self-renewal of normal mammary stem cells.
Appendix
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Metadata
Title
Role of Notch signaling in cell-fate determination of human mammary stem/progenitor cells
Authors
Gabriela Dontu
Kyle W Jackson
Erin McNicholas
Mari J Kawamura
Wissam M Abdallah
Max S Wicha
Publication date
01-12-2004
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 6/2004
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr920

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